@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setAttribute("currentPage", "bills");
req.setAttribute("page", "/bill/show.jsp");
YFBill bill = billService.getBill(Long.parseLong(req.getParameter("id")));
req.setAttribute("bill", bill);
req.setAttribute("orders", orderService.getBillOrders(bill));
req.getRequestDispatcher("/index.jsp").forward(req, resp);
}